From: "Adrián Herrera" <adr.her.arc.95@gmail.com>
To: Sami Mujawar <Sami.Mujawar@arm.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>,
Joey Gouly <Joey.Gouly@arm.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
"leif@nuviainc.com" <leif@nuviainc.com>, nd <nd@arm.com>
Subject: Re: [edk2-devel] [PATCH] ArmPkg/ArmGicLib: fix maximum interrupts supported
Date: Tue, 27 Apr 2021 10:48:01 +0100 [thread overview]
Message-ID: <CAB9FvTG7ABnaj1Ey385F6ZXj1k29Zs6QKbSM2f1mQ4j01cmD0w@mail.gmail.com> (raw)
In-Reply-To: <AM6PR08MB37849AD705E8464FBD9B025284429@AM6PR08MB3784.eurprd08.prod.outlook.com>
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Hi Sami,
That patch provides the same solution. I'll be sure to check the mailing
list before sending the next time.
Any benefit on marking this as duplicate? If so, how could I do it?
Thank you,
Adrián.
On Mon, 26 Apr 2021 at 08:56, Sami Mujawar <Sami.Mujawar@arm.com> wrote:
> Hi Adrian,
>
>
>
> I believe there is already a similar patch on the mailing list at
> https://edk2.groups.io/g/devel/message/72596. This patch is pending
> review and tested-by.
>
> Can you check if this patch covers the problems you describe, please?
>
>
>
> Regards,
>
>
>
> Sami Mujawar
>
>
>
> *From: *devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Adrián
> Herrera via groups.io <adr.her.arc.95=gmail.com@groups.io>
> *Date: *Saturday, 24 April 2021 at 03:57
> *To: *devel@edk2.groups.io <devel@edk2.groups.io>
> *Cc: *Adrián Herrera <adr.her.arc.95@gmail.com>
> *Subject: *[edk2-devel] [PATCH] ArmPkg/ArmGicLib: fix maximum interrupts
> supported
>
> The maximum number of interrupts supported is determined as
> 32 * (GICD_TYPER.ITLinesNumber + 1).
>
> When GICD_TYPER.ITLinesNumber = 0b11111, the maximum number of
> interrupts supported is 1024. However, both GICv2 and GICv3 reserve
> INTIDs 1020-1023 for special purposes.
>
> This results in runtime crashes because:
> (1) ArmGicLib functions do not guard against special interrupts.
> (2) ArmGicGetMaxNumInterrupts number includes special interrupts.
> (2) ArmGicV*Dxe relies on ArmGicGetMaxNumInterrupts, and thus
> programs special interrupts through ArmGicLib.
>
> ArmGicGetMaxNumInterrupts now does not include special interrupts, that
> is, it reports 1020 instead of 1024 when GICD_TYPER.ITLinesNumber =
> 0b11111.
> This avoids the overhead of guarding ArmGicLib functions while not
> requiring to modify the drivers code.
>
> Signed-off-by: Adrián Herrera <adr.her.arc.95@gmail.com>
> ---
> ArmPkg/Drivers/ArmGic/ArmGicLib.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
> b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
> index 6b01c88206..dff1401e9c 100644
> --- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
> +++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
> @@ -120,7 +120,10 @@ ArmGicGetMaxNumInterrupts (
> IN INTN GicDistributorBase
>
>
> )
>
>
> {
>
>
> - return 32 * ((MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) & 0x1F)
> + 1);
>
>
> + UINT32 ITLinesNumber;
>
>
> +
>
>
> + ITLinesNumber = MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) &
> 0x1F;
>
>
> + return MIN (32 * (ITLinesNumber+ 1), 1020);
>
>
> }
>
>
>
>
>
> VOID
>
>
> --
> 2.30.0
>
>
>
>
>
>
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next prev parent reply other threads:[~2021-04-27 9:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-23 19:40 [PATCH] ArmPkg/ArmGicLib: fix maximum interrupts supported adr.her.arc.95
2021-04-26 7:56 ` [edk2-devel] " Sami Mujawar
2021-04-27 9:48 ` Adrián Herrera [this message]
2021-04-27 12:41 ` Sami Mujawar
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